Don't store key when using SSH Proxy

I keep being bothered by having to delete the ssh key from the known_hosts file every time I use the SSH Proxy. On this web page I found a great workaround - http://linuxcommando.blogspot.com/200...
Now I have a command in a script: ssh -o UserKnownHostsFile=/dev/null -o StrictHostKeyChecking=no admin@localhost -p 10000

And as an iTerm user on the Mac I put this command in a Profile called Aerohive Proxy.